Foster Lake Loop is a 29.1 mile lightly trafficked loop trail located near Trinity Center, California that features a lake and is only recommended for very experienced adventurers. The trail is primarily used for hiking, trail running, camping, and backpacking and is accessible from June until October. Dogs are also able to use this trail.
I'm not sure if we did the loop in the same direction as AllTrails, but here's how we did it...Boulder Lake TH past the bigger lake, going up the Tracy Trail to Thumb Rock Trail, then descending towards Union Creek into a meadow. We found cairns & signage to Lander's Lake & headed back up, passing through a beautiful meadow before reaching the lake.There are a few good camp-sites at the small lake, which is set beneath a mound of red rock.That evening we explored above the lake & found ponds & a view down to Union Lake. Hiking out the next morning, we went back down to the Union Lake Spur, then went up, up, up to Foster Lake for a well-deserved break!Before reaching the lake, we were climbing a granite staircase surrounded by wildflowers, with a view of the valley at our feet & the mountains we just came down from & beyond. There were ponds & a good camp-site at Foster, but we had to continue out. A few more feet of climbing , then we started descent past Lion Lake, eventually crossing over Boulder Creek & heading back up to Boulder Lake before the final mile or two to the trailhead.